Abstract: A portable shelter including a light-weight frame that is collapsible and supports a strong, light-weight covering or skin that is removably secured to the frame is disclosed. The frame may include a base which supports a plurality of articulated arms that are movable between an extended and a non-extended position by the provision of a tension wire. A main roof having an opening therethrough is positioned over the articulated arms and tension wire in the assembled position. The opening is sized to receive an umbrella unit therethrough. The umbrella unit is preferably movable between an open and closed position. When in the open position the umbrella unit forms part of a continuous roof of the shelter, and in the closed, or partially closed position, the umbrella unit extends upwardly such that the interior of the tent is fluidly connected to the outer atmosphere through the opening in the main roof.